Examine source code of optimus-dark

{
  "name": "optimus",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "optimus_hdr.png"
    },
    "colors": {
      "frame": "rgba(63, 63, 63, 1)",
      "tab_background_text": "rgba(255, 198, 0, 1)",
      "toolbar": "rgba(47, 47, 47, 1)",
      "bookmark_text": "rgba(232, 73, 0, 1)",
      "toolbar_field": "rgba(63, 63, 63, 1)",
      "toolbar_field_text": "rgba(255, 198, 0, 1)"
    }
  }
}